George Recently Found a Painting in His Grandmother's Attic

George recently found a painting in his grandmother's attic. Being untrained in art, he had the piece appraised by the renowned art auction house, Sotheby's of London, which verified it as a lost Monet. George agrees to sell it to you for $30,000,000. It now transpires that the painting is a forgery. The contract is voidable because of:

A) Duress.
B) Innocent misrepresentation.
C) Fraud.
D) Undue influence.
E) None of the above.